In article om,
"billcalley" wrote:

2. Find the single trimmer capacitor located near the 500Hz CW filter
(the trimmer capacitor will be able to shift the 500Hz CW filter
center frequency by some small amount).

Bill-

You may be able to accomplish your goal without a counter, but the
trimmer you need to adjust is one of a group of three next to three
crystals on the carrier unit. It is probably not on the filter board
unless the two boards are combined in the TS-530.

I don't know for sure if the TS-520 manual is applicable. Although it
shows the crystals and trimmers in a photo and on the circuit diagram, I
couldn't find a procedure for their adjustment. It would help if you
could find a copy of the TS-530 service manual.

Fred
K4DII